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Finding the Fourth Proportional to 561.13, 841.56 and 171.21

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Solution

The fourth proportional to 561.13, 841.56 and 171.21 is: 256.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.13 : 841.56 = 171.21 : x
  2. Step 2: Convert to fraction form
    561.13/841.56 = 171.21/x
  3. Step 3: Cross multiply
    561.13x = 841.56 × 171.21
  4. Step 4: Simplify right side
    561.13x = 144,083.49
  5. Step 5: Solve for x
    x = 144,083.49/561.13
  6. Step 6: Final answer
    x = 256.77

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.